//----------------------------------
//
//**
// *
// * @authors liwb(lwbhtml@163.com)
// * @date    2017/7/3 13:44
// * @version $
// * @desc 图片响应式，retina等 摘自bootstrap
// */
//----------------------------------

// Image Mixins
// - Responsive image
// - Retina image


// Responsive image
//
// Keep images from scaling beyond the width of their parents.
.img-responsive(@display: block) {
  display: @display;
  max-width: 100%; // Part 1: Set a maximum relative to the parent
  height: auto; // Part 2: Scale the height according to the width, otherwise you get stretching
}


// Retina image
//
// Short retina mixin for setting background-image and -size. Note that the
// spelling of `min--moz-device-pixel-ratio` is intentional.
.img-retina(@file-1x; @file-2x; @file-3x; @width-1x; @height-1x;) {
  background-image: url("@{file-1x}");

  @media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) {
    background-image: url("@{file-2x}");
    background-size: @width-1x @height-1x;
  }

  @media
  only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and  (min-device-pixel-ratio: 3) {
    background-image: url("@{file-3x}");
    background-size: @width-1x @height-1x;
  }
}
